As far as I can see the pending question is not limited to whats(what’s) better to watch and could as well be interpreted as what’s better to play.

As I have had the fortunate experience of having played all the sports mentioned:
American football: a couple of teams here in Norway and I used to train with the center on Bergen Bulldogs whilst in college.
Soccer the sport where you actually use your feet to some extent: Played actively until High school.
Baseball: I have a bat, glove and ball. Introduced to the game by some Mormon friends and actually tried to organise a local team in Bergen.
Cricket: I used to live in Australia and played some with Australian kids.

Conclusion: Soccer is the most fun sport to play… and hence is the better.